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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
Assuming your alternator is working correctly, go to a Autoparts store that offers free charging system test. Autozone is the one I use.. They put an pickup on a battery cable, you bring the rpms up to about 2k.. and they tell you how many amps it is putting out. From what I've seen most chain autoparts stores only carry the 90 amp one anyway.